<template>
  <div class="component-upload-video">
    <el-upload
      multiple
      :action="uploadVideoUrl"
      list-type="picture-card"
      :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload"
      :data="data"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      ref="videoUpload"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handleVideoCardPreview"
      :class="{hide: this.fileList.length >= this.limit}"
    >
      <i class="el-icon-plus"></i>
      <div slot="file" slot-scope="{file}">
        <div class="video-item">
          <div class="video-thumbnail">
            <i class="el-icon-video-play"></i>
          </div>
          <span class="video-name">{{ file.name }}</span>
          <span class="video-actions">
            <i class="el-icon-view" @click="handleVideoCardPreview(file)"></i>
            <i class="el-icon-delete" @click="handleDelete(file)"></i>
          </span>
        </div>
      </div>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的视频文件
    </div>

    <!-- 视频预览对话框 -->
    <el-dialog
      :visible.sync="dialogVisible"
      title="视频预览"
      width="800"
      append-to-body
      @close="pauseVideo"
    >
      <div class="video-preview-container">
        <video
          ref="previewVideo"
          :src="dialogVideoUrl"
          controls
          style="display: block; width: 100%; max-height: 500px;"
        ></video>
        <div class="video-info" v-if="currentVideoInfo">
          <p><span>文件名：</span>{{ currentVideoInfo.name }}</p>
          <p><span>格式：</span>{{ currentVideoInfo.extension }}</p>
        </div>
      </div>
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";
import { isExternal } from "@/utils/validate";

export default {
  name: "ComponentUploadVideo",
  props: {
    value: [String, Object, Array],
    // 上传接口地址
    action: {
      type: String,
      default: "/common/upload"
    },
    // 上传携带的参数
    data: {
      type: Object
    },
    // 视频数量限制
    limit: {
      type: Number,
      default: 3,
    },
    // 大小限制(MB)
    fileSize: {
       type: Number,
      default: 100,
    },
    // 文件类型, 例如['mp4', 'avi', 'mov']
    fileType: {
      type: Array,
      default: () => ["mp4", "avi", "mov", "mkv", "flv", "wmv"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogVideoUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadVideoUrl: process.env.VUE_APP_BASE_API + this.action, // 上传的视频服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
      currentVideoInfo: null
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              if (item.indexOf(this.baseUrl) === -1 && !isExternal(item)) {
                  item = { name: item.substring(item.lastIndexOf('/') + 1), url: this.baseUrl + item };
              } else {
                  item = { name: item.substring(item.lastIndexOf('/') + 1), url: item };
              }
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isVideo = false;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isVideo = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      } else {
        isVideo = file.type.indexOf("video") > -1;
      }

      if (!isVideo) {
        this.$modal.msgError(`文件格式不正确，请上传${this.fileType.join("/")}视频格式文件!`);
        return false;
      }
      if (file.name.includes(',')) {
        this.$modal.msgError('文件名不正确，不能包含英文逗号!');
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传视频大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传视频，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传视频数量不能超过 ${this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({ 
          name: file.name, 
          url: res.fileName,
          size: file.size,
          extension: this.getFileExtension(file.name)
        });
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.videoUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除视频
    handleDelete(file) {
      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit("input", this.listToString(this.fileList));
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传视频失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 视频预览
    handleVideoCardPreview(file) {
        console.log(file)
      this.dialogVideoUrl = file.url;
      this.currentVideoInfo = {
        name: file.name,
        extension: this.getFileExtension(file.name)
      };
      this.dialogVisible = true;
      this.$nextTick(() => {
        if (this.$refs.previewVideo) {
          this.$refs.previewVideo.play();
        }
      });
    },
    // 暂停视频
    pauseVideo() {
      if (this.$refs.previewVideo) {
        this.$refs.previewVideo.pause();
      }
    },
    // 获取文件扩展名
    getFileExtension(filename) {
      return filename.slice((filename.lastIndexOf(".") - 1 >>> 0) + 2);
    },
    // 格式化文件大小
    formatFileSize(bytes) {
      if (bytes === 0) return '0 Bytes';
      const k = 1024;
      const sizes = ['Bytes', 'KB', 'MB', 'GB'];
      const i = Math.floor(Math.log(bytes) / Math.log(k));
      return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          // 移除基础URL部分，只保留相对路径
          let url = list[i].url;
          if (url.startsWith(this.baseUrl)) {
            url = url.substring(this.baseUrl.length);
          }
          strs += url + separator;
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>

<style scoped lang="scss">
.component-upload-video {
  ::v-deep .el-upload-list--picture-card .el-upload-list__item {
    width: 220px;
    height: 120px;
    overflow: hidden;
  }
  
  .video-item {
    position: relative;
    width: 100%;
    height: 100%;
    
    .video-thumbnail {
      width: 100%;
      height: 80px;
      background: #f5f7fa;
      display: flex;
      align-items: center;
      justify-content: center;
      border-bottom: 1px solid #ebeef5;
      
      .el-icon-video-play {
        font-size: 40px;
        color: #909399;
      }
    }
    
    .video-name {
      display: block;
      padding: 5px;
      font-size: 12px;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }
    
    .video-actions {
      position: absolute;
      top: 5px;
      right: 5px;
      display: none;
      
      i {
        margin-left: 5px;
        color: #fff;
        background: rgba(0,0,0,0.5);
        padding: 3px;
        border-radius: 2px;
        cursor: pointer;
        
        &:hover {
          background: rgba(0,0,0,0.7);
        }
      }
    }
    
    &:hover .video-actions {
      display: block;
    }
  }
  
  .video-preview-container {
    .video-info {
      margin-top: 15px;
      padding: 10px;
      background: #f5f7fa;
      border-radius: 4px;
      
      p {
        margin: 5px 0;
        font-size: 14px;
        
        span {
          color: #909399;
          margin-right: 10px;
        }
      }
    }
  }
  
  // 隐藏上传按钮
  ::v-deep.hide .el-upload--picture-card {
      display: none;
  }
}
</style>